317 lines
12 KiB
C++
317 lines
12 KiB
C++
#ifndef QUERY_ENTITY_QUERY_BUILDER_HPP
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#define QUERY_ENTITY_QUERY_BUILDER_HPP
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#include "matador/query/query_builder_exception.hpp"
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#include "matador/query/criteria.hpp"
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#include "matador/query/query.hpp"
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#include "matador/sql/statement.hpp"
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#include "matador/object/join_columns_collector.hpp"
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#include "matador/object/repository.hpp"
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#include "matador/query/criteria/criteria_visitor.hpp"
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#include "matador/utils/primary_key_attribute.hpp"
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#include "matador/utils/result.hpp"
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#include "matador/utils/value.hpp"
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#include <stack>
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#include <unordered_map>
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namespace matador::query {
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struct entity_query_data {
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const table* root_table{nullptr};
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std::string pk_column_name{};
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std::vector<table_column> columns{};
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std::unordered_map<std::string, sql::statement> lazy_loading_statements{};
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std::vector<join_data> joins{};
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criteria_ptr where_clause{};
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};
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class criteria_transformer final : public criteria_visitor {
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public:
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criteria_transformer(const basic_schema &repo, const std::unordered_map<std::string, table>& tables_by_name);
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void visit( const between_criteria& node ) override;
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void visit( const binary_criteria& node ) override;
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void visit( const binary_column_criteria& node ) override;
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void visit( const collection_criteria& node ) override;
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void visit( const check_null_criteria& node ) override;
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void visit( const collection_query_criteria& node ) override;
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void visit( const like_criteria& node ) override;
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void visit( const logical_criteria& node ) override;
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void visit( const not_criteria& node ) override;
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private:
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void update_criteria_column(const abstract_column_criteria& node) const;
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private:
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const basic_schema &repo_;
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const std::unordered_map<std::string, table>& tables_by_name_;
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};
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class query_builder final {
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public:
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query_builder(const basic_schema &scm, sql::executor &exec)
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: schema_(scm)
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, executor_(exec){}
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template<class EntityType>
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utils::result<entity_query_data, query_build_error> build(criteria_ptr clause = {}) {
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const auto it = schema_.find(typeid(EntityType));
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if (it == schema_.end()) {
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return utils::failure(query_build_error::UnknownType);
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}
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table_info_stack_.push({it->second.node().info(), it->second.table().as(build_alias('t', ++table_index))});
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entity_query_data_ = { &table_info_stack_.top().table };
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processed_tables_.insert({it->second.name(), *entity_query_data_.root_table});
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try {
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EntityType obj;
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access::process(*this, obj);
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if (clause) {
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criteria_transformer transformer{schema_, processed_tables_};
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clause->accept(transformer);
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entity_query_data_.where_clause = std::move(clause);
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}
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return {utils::ok(std::move(entity_query_data_))};
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} catch (const query_builder_exception &ex) {
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return {utils::failure(ex.error_type())};
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} catch (...) {
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return {utils::failure(query_build_error::UnexpectedError)};
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}
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}
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template < class V >
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void on_primary_key(const char *id, V &, const utils::primary_key_attribute& /*attr*/ = utils::default_pk_attributes) {
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push(id);
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if (!is_root_entity()) {
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return;
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}
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entity_query_data_.pk_column_name = id;
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}
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void on_revision(const char *id, uint64_t &/*rev*/);
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template<typename Type>
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void on_attribute(const char *id, Type &, const utils::field_attributes &/*attr*/ = utils::null_attributes)
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{
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push(id);
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}
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template<class Pointer>
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void on_belongs_to(const char *id, Pointer &obj, const utils::foreign_attributes &attr) {
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on_foreign_object(id, obj, attr);
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}
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template<class Pointer>
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void on_has_one(const char *id, Pointer &obj, const utils::foreign_attributes &attr) {
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on_foreign_object(id, obj, attr);
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}
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template<typename T>
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struct NoopDeleter {
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void operator()(const T*) const {}
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};
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template<class CollectionType>
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void on_has_many(const char * /*id*/, CollectionType &, const char *join_column, const utils::foreign_attributes &attr, std::enable_if_t<object::is_object_ptr<typename CollectionType::value_type>::value> * = nullptr) {
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if (attr.fetch() != utils::fetch_type::Eager) {
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return;
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}
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const auto it = schema_.find(typeid(typename CollectionType::value_type::value_type));
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if (it == schema_.end()) {
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throw query_builder_exception{query_build_error::UnknownType};
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}
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auto next = processed_tables_.find(it->second.name());
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if (next != processed_tables_.end()) {
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// node already processed
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return;
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}
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table_info_stack_.push({it->second.node().info(), it->second.table().as(build_alias('t', ++table_index))});
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next = processed_tables_.insert({it->second.name(), table_info_stack_.top().table}).first;
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typename CollectionType::value_type::value_type obj;
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access::process(*this , obj);
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table_info_stack_.pop();
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if (!it->second.node().info().has_primary_key()) {
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throw query_builder_exception{query_build_error::MissingPrimaryKey};
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}
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append_join(
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table_column{&table_info_stack_.top().table, table_info_stack_.top().info.primary_key_attribute()->name()},
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table_column{&next->second, join_column}
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);
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}
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template<class CollectionType>
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void on_has_many(const char * /*id*/, CollectionType &, const char *join_column, const utils::foreign_attributes &attr, std::enable_if_t<!object::is_object_ptr<typename CollectionType::value_type>::value> * = nullptr) {
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}
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template<class ContainerType>
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void on_has_many_to_many(const char *id, ContainerType &/*cont*/, const char *join_column, const char *inverse_join_column, const utils::foreign_attributes &attr) {
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if (attr.fetch() != utils::fetch_type::Eager) {
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return;
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}
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const auto result = schema_.find(typeid(typename ContainerType::value_type::value_type));
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if (result == schema_.end()) {
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throw query_builder_exception{query_build_error::UnknownType};
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}
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auto next = processed_tables_.find(result->second.name());
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if (next != processed_tables_.end()) {
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// attribute was already processed
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return;
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}
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auto relation = processed_tables_.find(id);
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if (relation == processed_tables_.end()) {
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const auto it = schema_.find(id);
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if (it == schema_.end()) {
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throw query_builder_exception{query_build_error::UnknownType};
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}
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relation = processed_tables_.emplace(id, it->second.table().as(build_alias('t', ++table_index))).first;
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}
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table_info_stack_.push({result->second.node().info(), result->second.table().as(build_alias('t', ++table_index))});
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next = processed_tables_.insert({result->second.name(), table_info_stack_.top().table}).first;
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typename ContainerType::value_type::value_type obj;
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access::process(*this , obj);
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table_info_stack_.pop();
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if (!result->second.node().info().has_primary_key()) {
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throw query_builder_exception{query_build_error::MissingPrimaryKey};
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}
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append_join(
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table_column{&table_info_stack_.top().table, table_info_stack_.top().info.primary_key_attribute()->name()},
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table_column{&relation->second, join_column}
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);
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append_join(
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table_column{&relation->second, inverse_join_column},
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table_column{&next->second, result->second.node().info().primary_key_attribute()->name()}
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);
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}
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template<class ContainerType>
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void on_has_many_to_many(const char *id, ContainerType &/*cont*/, const utils::foreign_attributes &attr) {
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if (attr.fetch() != utils::fetch_type::Eager) {
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return;
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}
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const auto result = schema_.find(typeid(typename ContainerType::value_type::value_type));
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if (result == schema_.end()) {
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throw query_builder_exception{query_build_error::UnknownType};
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}
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auto next = processed_tables_.find(result->second.name());
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if (next != processed_tables_.end()) {
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// attribute was already processed
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return;
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}
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auto relation = processed_tables_.find(id);
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if (relation == processed_tables_.end()) {
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const auto it = schema_.find(id);
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if (it == schema_.end()) {
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throw query_builder_exception{query_build_error::UnknownType};
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}
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const auto t = it->second.table().as(build_alias('t', ++table_index));
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relation = processed_tables_.insert({id, t}).first;
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}
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table_info_stack_.push({result->second.node().info(), result->second.table().as(build_alias('t', ++table_index))});
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next = processed_tables_.insert({result->second.name(), table_info_stack_.top().table}).first;
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typename ContainerType::value_type::value_type obj;
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access::process(*this , obj);
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table_info_stack_.pop();
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if (!result->second.node().info().has_primary_key()) {
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throw query_builder_exception{query_build_error::MissingPrimaryKey};
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}
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const auto join_columns = join_columns_collector_.collect<typename ContainerType::value_type::value_type>();
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append_join(
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table_column{&table_info_stack_.top().table, table_info_stack_.top().info.primary_key_attribute()->name()},
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table_column{&relation->second, join_columns.inverse_join_column}
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);
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append_join(
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table_column{&relation->second, join_columns.join_column},
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table_column{&next->second, result->second.node().info().primary_key_attribute()->name()}
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);
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}
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private:
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template<class Pointer>
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void on_foreign_object(const char *id, Pointer &, const utils::foreign_attributes &attr);
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void push(const std::string &column_name);
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static std::string build_alias(char prefix, unsigned int count);
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[[nodiscard]] bool is_root_entity() const;
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void append_join(const table_column &left, const table_column &right);
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private:
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struct table_info {
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const object::basic_object_info &info;
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class table table;
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};
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std::stack<table_info> table_info_stack_{};
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std::unordered_map<std::string, table> processed_tables_{};
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const basic_schema &schema_;
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entity_query_data entity_query_data_{};
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unsigned int column_index{0};
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unsigned int table_index{0};
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object::join_columns_collector join_columns_collector_{};
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sql::executor &executor_;
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};
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template<class Pointer>
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void query_builder::on_foreign_object(const char *id, Pointer &, const utils::foreign_attributes &attr) {
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const auto it = schema_.find(typeid(typename Pointer::value_type));
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if (it == schema_.end()) {
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throw query_builder_exception{query_build_error::UnknownType};
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}
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if (!it->second.node().info().has_primary_key()) {
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throw query_builder_exception{query_build_error::MissingPrimaryKey};
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}
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const auto& info = it->second.node().info();
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auto foreign_table = it->second.table().as(build_alias('t', ++table_index));
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if (attr.fetch() == utils::fetch_type::Eager) {
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auto next = processed_tables_.find(info.name());
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if (next != processed_tables_.end()) {
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return;
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}
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table_info_stack_.push({info, std::move(foreign_table)});
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next = processed_tables_.insert({info.name(), table_info_stack_.top().table}).first;
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typename Pointer::value_type obj;
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access::process(*this, obj);
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table_info_stack_.pop();
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append_join(
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table_column{&table_info_stack_.top().table, id},
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table_column{&next->second, info.primary_key_attribute()->name()}
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);
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} else {
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push(id);
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using namespace matador::utils;
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using namespace matador::query;
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// create select query
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auto result = query::query::select(generator::columns<typename Pointer::value_type>(schema_, foreign_table, generator::column_generator_options::ForceLazy))
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.from(foreign_table)
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.where(table_column(&foreign_table, info.primary_key_attribute()->name(), "") == _)
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.prepare(executor_);
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if (!result) {
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throw query_builder_exception(query_build_error::QueryError, result.release_error());
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}
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entity_query_data_.lazy_loading_statements.emplace(id, std::move(result.release()));
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}
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}
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}
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#endif //QUERY_ENTITY_QUERY_BUILDER_HPP
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